#include "master.hpp"
-namespace factor
-{
-
-profiling_sample::profiling_sample(factor_vm *vm,
- cell sample_count,
- cell gc_sample_count,
- context *ctx)
- :
- sample_count(sample_count),
- gc_sample_count(gc_sample_count),
- ctx(ctx)
-{
- vm->record_callstack_sample(&callstack_begin, &callstack_end);
+namespace factor {
+
+// This is like the growable_array class, except the whole of it
+// exists on the Factor heap. growarr = growable array.
+static cell growarr_capacity(array *growarr) {
+ return untag_fixnum(growarr->data()[0]);
}
-void factor_vm::record_sample()
-{
- cell recorded_sample_count;
- cell recorded_gc_sample_count;
-
- recorded_sample_count = safepoint_sample_count;
- recorded_gc_sample_count = safepoint_gc_sample_count;
- if (recorded_sample_count == 0 && recorded_gc_sample_count == 0)
- return;
-
- /* Another sample signal could be raised while we record these counts */
- FACTOR_ATOMIC_SUB(&safepoint_sample_count, recorded_sample_count);
- FACTOR_ATOMIC_SUB(&safepoint_gc_sample_count, recorded_gc_sample_count);
-
- samples.push_back(profiling_sample(
- this,
- recorded_sample_count,
- recorded_gc_sample_count,
- ctx
- ));
+static cell growarr_nth(array *growarr, cell slot) {
+ return array_nth(untag<array>(growarr->data()[1]), slot);
}
-void factor_vm::record_callstack_sample(cell *begin, cell *end)
-{
- *begin = sample_callstacks.size();
- stack_frame *frame = ctx->callstack_bottom - 1;
+// Allocates memory
+array* factor_vm::allot_growarr() {
+ data_root<array> contents(allot_array(10, false_object), this);
+ array *growarr = allot_uninitialized_array<array>(2);
+ set_array_nth(growarr, 0, tag_fixnum(0));
+ set_array_nth(growarr, 1, contents.value());
+ return growarr;
+}
- while (frame >= ctx->callstack_top) {
- sample_callstacks.push_back((code_block*)frame->entry_point - 1);
- frame = frame_successor(frame);
- }
+// Allocates memory
+void factor_vm::growarr_add(array *growarr_, cell elt_) {
+ data_root<array> growarr(growarr_, this);
+ data_root<object> elt(elt_, this);
+ data_root<array> contents(growarr.untagged()->data()[1], this);
- *end = sample_callstacks.size();
+ cell count = growarr_capacity(growarr.untagged());
+ if (count == array_capacity(contents.untagged())) {
+ contents.set_untagged(reallot_array(contents.untagged(), 2 * count));
+ set_array_nth(growarr.untagged(), 1, contents.value());
+ }
+ set_array_nth(contents.untagged(), count, elt.value());
+ set_array_nth(growarr.untagged(), 0, tag_fixnum(count + 1));
}
-void factor_vm::set_sampling_profiler(bool sampling_p)
-{
- if (sampling_p == sampling_profiler_p)
- return;
-
- if (sampling_p)
- start_sampling_profiler();
- else
- end_sampling_profiler();
+profiling_sample profiling_sample::record_counts() volatile {
+ atomic::fence();
+ profiling_sample returned(sample_count, gc_sample_count,
+ jit_sample_count, foreign_sample_count,
+ foreign_thread_sample_count);
+ atomic::fetch_subtract(&sample_count, returned.sample_count);
+ atomic::fetch_subtract(&gc_sample_count, returned.gc_sample_count);
+ atomic::fetch_subtract(&jit_sample_count, returned.jit_sample_count);
+ atomic::fetch_subtract(&foreign_sample_count, returned.foreign_sample_count);
+ atomic::fetch_subtract(&foreign_thread_sample_count,
+ returned.foreign_thread_sample_count);
+ return returned;
}
-void factor_vm::start_sampling_profiler()
-{
- safepoint_sample_count = 0;
- safepoint_gc_sample_count = 0;
- samples.clear();
- samples.reserve(10*FACTOR_PROFILE_SAMPLES_PER_SECOND);
- sample_callstacks.reserve(100*FACTOR_PROFILE_SAMPLES_PER_SECOND);
- sampling_profiler_p = true;
- start_sampling_profiler_timer();
+void profiling_sample::clear_counts() volatile {
+ sample_count = 0;
+ gc_sample_count = 0;
+ jit_sample_count = 0;
+ foreign_sample_count = 0;
+ foreign_thread_sample_count = 0;
+ atomic::fence();
}
-void factor_vm::end_sampling_profiler()
-{
- end_sampling_profiler_timer();
- record_sample();
- sampling_profiler_p = false;
+// Allocates memory
+void factor_vm::record_sample(bool prolog_p) {
+ profiling_sample result = current_sample.record_counts();
+ if (result.empty()) {
+ return;
+ }
+ // Appends the callstack, which is just a sequence of quotation or
+ // word references, to sample_callstacks.
+ cell callstacks_cell = special_objects[OBJ_SAMPLE_CALLSTACKS];
+ data_root<array> callstacks = data_root<array>(callstacks_cell, this);
+ cell begin = growarr_capacity(callstacks.untagged());
+
+ bool skip_p = prolog_p;
+ auto recorder = [&](cell frame_top, cell size, code_block* owner, cell addr) {
+ (void)frame_top;
+ (void)size;
+ (void)addr;
+ if (skip_p)
+ skip_p = false;
+ else {
+ growarr_add(callstacks.untagged(), owner->owner);
+ }
+ };
+ iterate_callstack(ctx, recorder);
+ cell end = growarr_capacity(callstacks.untagged());
+
+ // Add the sample.
+ result.thread = special_objects[OBJ_CURRENT_THREAD];
+ result.callstack_begin = begin;
+ result.callstack_end = end;
+ samples.push_back(result);
}
-void factor_vm::primitive_sampling_profiler()
-{
- set_sampling_profiler(to_boolean(ctx->pop()));
+// Allocates memory
+void factor_vm::set_profiling(fixnum rate) {
+ bool running_p = atomic::load(&sampling_profiler_p);
+ if (rate > 0 && !running_p)
+ start_sampling_profiler(rate);
+ else if (rate == 0 && running_p)
+ end_sampling_profiler();
}
+// Allocates memory
+void factor_vm::start_sampling_profiler(fixnum rate) {
+ special_objects[OBJ_SAMPLE_CALLSTACKS] = tag<array>(allot_growarr());
+ samples_per_second = rate;
+ current_sample.clear_counts();
+ // Release the memory consumed by collecting samples.
+ samples.clear();
+ samples.shrink_to_fit();
+ samples.reserve(10 * rate);
+ atomic::store(&sampling_profiler_p, true);
+ start_sampling_profiler_timer();
+}
+
+void factor_vm::end_sampling_profiler() {
+ atomic::store(&sampling_profiler_p, false);
+ end_sampling_profiler_timer();
+ record_sample(false);
+}
+
+// Allocates memory
+void factor_vm::primitive_set_profiling() {
+ set_profiling(to_fixnum(ctx->pop()));
+}
+
+// Allocates memory
+void factor_vm::primitive_get_samples() {
+ if (atomic::load(&sampling_profiler_p) || samples.empty()) {
+ ctx->push(false_object);
+ return;
+ }
+ data_root<array> samples_array(allot_array(samples.size(), false_object),
+ this);
+ std::vector<profiling_sample>::const_iterator from_iter = samples.begin();
+ cell to_i = 0;
+
+ cell callstacks_cell = special_objects[OBJ_SAMPLE_CALLSTACKS];
+ data_root<array> callstacks = data_root<array>(callstacks_cell, this);
+
+ for (; from_iter != samples.end(); ++from_iter, ++to_i) {
+ data_root<array> sample(allot_array(7, false_object), this);
+
+ set_array_nth(sample.untagged(), 0,
+ tag_fixnum(from_iter->sample_count));
+ set_array_nth(sample.untagged(), 1,
+ tag_fixnum(from_iter->gc_sample_count));
+ set_array_nth(sample.untagged(), 2,
+ tag_fixnum(from_iter->jit_sample_count));
+ set_array_nth(sample.untagged(), 3,
+ tag_fixnum(from_iter->foreign_sample_count));
+ set_array_nth(sample.untagged(), 4,
+ tag_fixnum(from_iter->foreign_thread_sample_count));
+
+ set_array_nth(sample.untagged(), 5, from_iter->thread);
+
+ cell callstack_size =
+ from_iter->callstack_end - from_iter->callstack_begin;
+ data_root<array> callstack(allot_array(callstack_size, false_object),
+ this);
+
+ for (cell i = 0; i < callstack_size; i++) {
+ cell block_owner = growarr_nth(callstacks.untagged(),
+ from_iter->callstack_begin + i);
+ set_array_nth(callstack.untagged(), i, block_owner);
+ }
+ set_array_nth(sample.untagged(), 6, callstack.value());
+ set_array_nth(samples_array.untagged(), to_i, sample.value());
+ }
+ ctx->push(samples_array.value());
+}
}
projects / factor.git / blobdiff